With ratings expited over 7 years, my understanding is that you have to redo the exams and flight tests.
I don't think you have to do the whole groundschool course, or redo all the flight training, it would be "training as required".
If you go to an FTO, they would put together a training package that would be appropriate for you to meet the requirements, but it's not going to be cheap or easy, could easily take 6 months or more especially having to relearn a load of stuff for ground exams.